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Metals 2019, 9(2), 216; https://doi.org/10.3390/met9020216

Identification of the Quasi-Static and Dynamic Behaviour of Projectile-Core Steel by Using Shear-Compression Specimens

Laboratoire 3SR (Sols, Solides, Structures–Risques), Grenoble INP , CNRS, Université Grenoble Alpes, 38000 Grenoble, France
Institute of Engineering Université Grenoble Alpes.
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Author to whom correspondence should be addressed.
Received: 24 December 2018 / Revised: 31 January 2019 / Accepted: 4 February 2019 / Published: 12 February 2019
(This article belongs to the Special Issue Metallic Materials under Dynamic Loading)
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Abstract

Armour-Piercing (AP) projectiles constitute a major threat to be considered for the design of bi-layer-armour configurations constructed using a ceramic front plate backed with a composite/metal layer. When they are not made of tungsten-carbide the cores of these projectiles are made of hard steel, and are the main part that defines the penetration performance of the projectile. However, due to specific testing difficulties, the dynamic behaviour of these high-strength steel AP projectiles has not been investigated in sufficient detail. In this study, a detailed experimental investigation of the dynamic behaviour of the steel used for the steel core of 7.62 mm BZ-type AP projectiles was analysed through the use of Shear-Compression Specimens (SCS). In this study, results from both quasi-static and dynamic experiments were examined. The data processing method employed was set and validated based on numerical simulations. Both quasi-static and dynamic SCS experiments were done with the steel tested which clearly indicated the steel cores exhibit a very high elastic limit, little strain-hardening, and very little strain-rate sensitivity despite the wide range of strain-rates considered. This experimental characterisation paves the way to the numerical modelling for the analysis of ballistic impact of 7.62 mm AP projectile against lightweight armour configurations. View Full-Text
Keywords: armour-piercing projectile; split Hopkinson pressure bar; strain-rate sensitivity; shear-compression test; high-strength steel armour-piercing projectile; split Hopkinson pressure bar; strain-rate sensitivity; shear-compression test; high-strength steel
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Duplan, Y.; Saletti, D.; Forquin, P. Identification of the Quasi-Static and Dynamic Behaviour of Projectile-Core Steel by Using Shear-Compression Specimens. Metals 2019, 9, 216.

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